82157723 has 4 divisors (see below), whose sum is σ = 84378240. Its totient is φ = 79937208.

The previous prime is 82157717. The next prime is 82157731. The reversal of 82157723 is 32775128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82157723 - 2⁶ = 82157659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82157773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110203 + ... + 1110276.

It is an arithmetic number, because the mean of its divisors is an integer number (21094560).

Almost surely, 2^82157723 is an apocalyptic number.

82157723 is a deficient number, since it is larger than the sum of its proper divisors (2220517).

82157723 is a wasteful number, since it uses less digits than its factorization.

82157723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220516.

The product of its digits is 23520, while the sum is 35.

The square root of 82157723 is about 9064.0897502176. The cubic root of 82157723 is about 434.7265167843.

The spelling of 82157723 in words is "eighty-two million, one hundred fifty-seven thousand, seven hundred twenty-three".